Engine experts input needed on used engine
 

Finally got around to pulling apart my engines and would like some insight as to what I have. The engines started out as 94 502 mpis.

what I've found so far
Block - GM 8.2 cast on side
Crank - seems to be stock (cut) casting 14097044
Pistons - JE 757F
Cam - CC 3114 3110 HR114 and F5284 engraved into end and 139516 95C2B stamped into cam near one of the lobes.
Heads - Merlin 1-043B (345CC Intake / 119CC Chamber, Rectangular Port – Cast Iron BBC)
Lifters - roller joined by bar that says up (no other markings)
Push rods - 3/8" no other markings
Rockers - Crane Gold 1.7 ratio

Computer was done in 1997 by ASM but they have no record of what was done (sticker has date)

I'm starting to think these were set up as blower motors and when the boat was sold they pulled blowers and threw on stock flame arresters. I'm not much of a motor guy and trying to figure out what I bought. Thanks in advance.

You can find the book "rebuilding the Gen V/VI Big Block" on Amazon for Kindle- much cheaper than the hard copy version which is hard to find.

Search for ISBN B0027G6WY8 by Mike Mavrigan - has all the parts, castings, etc. Covers stock and GMPP parts, but is not a book on mega HP builds. Best $6 you will ever spend

or 1613250525 - not sure if this covers Gen 5 and 6...

I'll deff look into that thanks.

the cam is a comp cams hyd roller,call them with the numbers and they will tell you what it is.

can you post a pic of the top of a piston.

Running a bit rich

because of the carbon buildup it is hard to tell if it is a flat top or has a small dome.

Flat

probibally not set up for supercharger,but could work for a lower boost setup,normally a j&e blower piston will have .300 or more distance from the top of piston to top of first ringland,also the wristpin for forced induction is a .180 wall pin.

fixx
 

looks like a stock 502 mag piston,,someone may have cur a deeper valve relief.. and like mike said its a comp cam,,looks loke a custom grind,,they stamp the mass produced ones..